{"id":"c4a8ad1c-2b6c-4683-84e1-10a9172c6476","shortId":"uFzEpG","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/274` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transactions/274` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. The actual behavior of this endpoint after payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.","The actual functionality and response format of /api/v1/transactions/274 is unknown; 'Premium API Access' is the only descriptor.","No OpenAPI or schema provided for request or response bodies.","Multiple advertised endpoint categories (AI, finance, analytics, etc.) cannot be verified from crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/274","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/274","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific function of /api/v1/transactions/274 is entirely 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'/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,169 'actual':197 'addit':194 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,168,183 'attach':93 'avail':208 'base':8,23,51,75 'behavior':198 'behind':159 'beyond':164 'broader':106 'call':4,19,82 'caller':91 'categori':111 'challeng':67 'classif':127 'connect':189 'content':195 'convers':144 'data':113,117 'doc':180 'document':163 'embed':128 'endpoint':55,147,201 'estim':138 'exampl':177 'exchang':133 'export':118 'feed':132 'financ':129 'function':158 'gas':137 'generat':145 'geocod':142 'header':98 'howev':155 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'key':85 'label':166 'learn':122 'limit':88 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'materi':209 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'openapi':173 'page':184 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103,203 'per':3,18,36,81,153 'platform':6,21,39,107 'premium':60,167 'price':131,150,181 'prompt':191 'proof':104 'protocol':44 'quot':136 'rate':87,134 'render':186 'report':116 'request':37,154 'request/response':176 'requir':68,90 'return':64 'schema':174 'sentiment':123 'simpli':92 'specif':54,157 'summar':126 'text':125 'token':135 'uniform':149 'unit':76 'unknown':205 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':190 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"626a0227-2535-48f8-8c7c-46fb9619a769","listingId":"c4a8ad1c-2b6c-4683-84e1-10a9172c6476","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/274","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:39.907Z"}],"sources":[{"listingId":"c4a8ad1c-2b6c-4683-84e1-10a9172c6476","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/274","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:39.907Z","lastSeenAt":"2026-04-22T07:31:50.555Z"}],"details":{"listingId":"c4a8ad1c-2b6c-4683-84e1-10a9172c6476","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/274 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/274"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/274"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility and data endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.588Z"},"updatedAt":"2026-04-22T07:31:50.555Z"}}